Joint USAF/NOAA Report of Solar and Geophysical Activity 01 Apr 2009

Product: Report of Solar-Geophysical Activity
Issued: 2009 Apr 01 2200 UTC
Prepared jointly by the U.S. Dept. of Commerce, NOAA,
Space Weather Prediction Center and the U.S. Air Force.

Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 091 Issued at 2200Z on 01 Apr 2009

IA. Analysis of Solar Active Regions and Activity from 31/2100Z to 01/2100Z: Solar activity was very low. No flares were observed during the past 24 hours. The visible disk remained spotless.

IB. Solar Activity Forecast: Solar activity is expected to be very low.

IIA. Geophysical Activity Summary 31/2100Z to 01/2100Z: The geomagnetic field was quiet.

IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be quiet on 02 April. Quiet to unsettled conditions are expected on 03-04 April, with a slight chance of active to minor storm periods at high latitudes.

III. Event Probabilities 02 Apr-04 Apr

• Class M 01/01/01
• Class X 01/01/01
• Proton 01/01/01
• PCAF Green

IV. Penticton 10.7 cm Flux

• Observed 01 Apr 071
• Predicted 02 Apr-04 Apr 072/072/072
• 90 Day Mean 01 Apr 070

V. Geomagnetic A Indices

• Observed Afr/Ap 31 Mar 002/004
• Estimated Afr/Ap 01 Apr 002/005
• Predicted Afr/Ap 02 Apr-04 Apr 005/005-007/008-007/008

VI. Geomagnetic Activity Probabilities 02 Apr-04 Apr

A. Middle Latitudes

• Active 05/10/10
• Minor storm 01/01/01
• Major-severe storm 01/01/01

B. High Latitudes

• Active 10/15/15
• Minor storm 01/05/05
• Major-severe storm 01/01/01